Low Flow, High Head – Self-Priming and Gas-Tolerant

Allweiler multistage side channel pumps are self-priming pumps for clean and aggressive liquids where small flows must be delivered against high heads. Thanks to the side channel stage they can handle liquids with up to 50% gas or vapour content, including low-boiling fluids such as LPG, and they are insensitive to cavitation when vapour pressure fluctuates. Low-NPSH versions suit poor suction conditions, and a sealless magnetic-drive version eliminates shaft seal leakage for hazardous fluids.

Range Overview (all horizontal, segmental-type, max. suction head 7 m)

  • SRZ – up to 36 m³/h, 350 m head, 40 bar, 220°C
  • SRZR – as SRZ with very low NPSH values
  • SFH – up to 20 m³/h, 250 m head, 25 bar, 120°C, very low NPSH values
  • SOH / SOHB – up to 7.5 m³/h, 150 m head, 16 bar, 120°C, also in block design
  • SEMA – magnetic coupling (sealless), up to 20 m³/h, 250 m head, 40 bar, 200°C

Key Advantages

  • Low NPSH requirements
  • Low flow rate at high head
  • Self-priming
  • Pumps gaseous liquids

Suited for: LPG and liquefied gas transfer, boiler feed and condensate, chemical and process dosing of ingredients, and water pressure boosting over large elevation changes.